Bug: Running our of file descriptors when playing emacspeak's auditory icons prevents large packages from being installed on Mac OS

[Parham Doustdar <parham90@xxxxxxxxxxx>]

Hi,

I'm using Emacs 27.0.50 with the latest Emacspeak from Github.

When installing packages like the latest version of `org-plus-contrib', or when connecting to an IRC server that stores missed messages with `erc', whenever I have auditory icons set to play and they are set to play with a "play program" (I use `afplay' on Mac OS), Emacspeak starts playing many auditory icons together. This leads to an error like this:

Debugger entered--Lisp error: (file-error "Creating pipe" "Too many open files")

  make-process(:name "afplay" :buffer nil :command ("afplay" "/Users/pdoustdar/src/emacspeak/sounds/3d/progress...."))
  apply(make-process (:name "afplay" :buffer nil :command ("afplay" "/Users/pdoustdar/src/emacspeak/sounds/3d/progress....")))
  start-process("afplay" nil "afplay" "/Users/pdoustdar/src/emacspeak/sounds/3d/progress....")
  emacspeak-play-auditory-icon(progress)
  emacspeak-auditory-icon(progress)
  ad-Advice-progress-reporter-do-update(#f(compiled-function (reporter value &optional suffix) #<bytecode 0x420f20c5>) (3 . [1566480002.2621872 nil nil "Extracting..." 1 0.2 "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..."]) "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..." nil)
  apply(ad-Advice-progress-reporter-do-update #f(compiled-function (reporter value &optional suffix) #<bytecode 0x420f20c5>) ((3 . [1566480002.2621872 nil nil "Extracting..." 1 0.2 "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..."]) "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..." nil))
  progress-reporter-do-update((3 . [1566480002.2621872 nil nil "Extracting..." 1 0.2 "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..."]) "/Users/pdoustdar/.emacs.d/elpa/org-plus-contrib-20..." nil)
  tar-untar-buffer()

I wonder if there's a way to prevent this from happening. I've searched in the Emacs mailing list and haven't found anything. The `make-process' function is a built-in function that is not in elisp, and I can't really understand what the limit is or how it can be queried from inside Emacs – `apropos-variable' hasn't found me anything useful.

Is there a way for Emacspeak to prevent this from happening when there are too many messages coming in, or when a progress bar is being updated too often?

Thanks!